Antenna



Oct. 16, 1928.

R. ENGEBRETSEN ANTENNA Filed Dec. 5, 1924 Patented Oct. 16, 1928.

PATENT OFFICE.

nAenVALn nnennnn'rsnn,

or BnooKLYn, NEW YORK.

ANTENNA.

Application filed December mounted upon a' base or pedestal for supporting the structure upon the roof of a building or the like.

A further object is to provide a globular antenna for use in eitherreceiving or broadcasting wireless waves.

lVith these and other objects in view, the invention resides in certainnovel construction and combination and arrangement of parts, theessential features of which are hereinafter fully described, areparticularly pointed out in the appended claim, and are illustrated inthe accompanying drawing, in which Figure 1 is a side elevation of myimproved antenna.

Figure 2 is a vertical sectional View of the line 22 of Figure 1. g

Figure 3 is a horizontal sectional view on the line 33 of Figure 1.

Figure 4: is a detail view of a modified form of frame.

Figure 5 is a detail view of one of thccollapsible bands. I

Referring more particularly to the drawing, the reference numeraldesignates my improved antenna in its entirety and wh ch includes aglobular cage 11, and a supporting structure 12. v

The globular cage 11 comprises a pair of opposed end plates 13, whichare connected by semi-circular wires or arcuateshaped iiienibers 1 whichextend radially'froni the vertical axis of the cage in equi-distantlyspaced relation. Extending circumferentially and horizontally about themembers or wires 14 are annular ringsor bands 15, which rings arearranged in equi-distantly spaced relation and intersecting the wires 14at which points the wires are soldered together to provide a rigidstructure. The wires l t and 15 are of copper material, it having beenproven 3, 1924. Serial No. 753,730.

that such material produces the maximum result although any othersuitable conducting material may be employed if desired,

The points of intersection of the wires 14:

and 15 are connected by cross wires .17 of a finer gauge material'thanthe wires 14 and 15, winch increases the capacity of material as it hasbeen found that a device of this nature constructed of approximatelyone-hundred feet of wire will produce the desired result. Cross wires16are likewise soldered to the intersection of the wires 14: and 15. Thesupporting structure 12 above referred to comprises a base 17 havingsuitable openings therein for the passage of fastening elements such asscrews for attaching the device to the roof of a building, and risingfrom the base is an upright or post 18 on which the cage is mounted. Themast is of insulating material to prevent wireless waves from beingground. The mast is also hollow for a portion of its length adjacent thetop and receives a lightning rod 19 which projects above the top of theglobular cage and which may be connected with the ground in any suitablemanner. This rod serves to protect the cage from being struck bylightning, it being understood that lightning when it strikes usuallystrikes the highest point.

The lead-in wire 20 which connects the antenna with the receivingapparatus is formed with branches 21, one branch being connected to eachof the respective wires or bands 14: adjacent the bottom of the cage,thereby providing a direct lead-in from the different radial directionsof the cage.

From the foregoing description, it will be seen that my invention willbe found convenient for use by amateurs in radio reception as the samemay be easily placed in position upon a building without detracting fromthe appearance of the same. Of course, the cage can be increased in sizeand mounted upon a suitable tower for use when employed for receiving orbroadcasting on an extensive basis.

In Figurese and 5, I have shown a slightly modified form in which eachof the semicircular wires 18 has its ends formed with a disk, the disksbeing rotatably connected one over the other as at 22 whereby they maybe spread to a radial position to receive the annular bands 14C, ormoved together when not in use,

The bands 14 are formed of a pair of semicircular sections28 connectedby'clips or the like 24, whereby they may be moved to a p07 sition oneover the other when not in use, and when in use the same constitute anannular band similar to; ;t;-h;a-t shown in the preferred form. Anysuitable means such as Wire connectors may be employed for holding thebands let in position upon the wires 13. This form of the invention willbe found c'onvenient for shipping and storing purposes.

VJhi-le I have descri-hedwhat I deem to be the most desirable embodimentof my inventio11,' 'it is obvious that many of the details may be variedWithout inany Way departing from the spirit of my invention, and I therefore do not limit myself to the enact details of constructionhei'ein setfortlrnor to anything less than the whole of my invention limited onlyby the appended claim. What is claimed as new is An antenna comprising aplurality of members and fixed-lyconnected thereto, cross 7 Wiresconnecting intersecting portions of said incmbersand said bands andllXGCl thereto, and lead-1n Wires 1o1n'edto' the rcspectlve arcua'teshaped members.

In testimony whereof I have aiiiXed my slgnature.

RAGNVALD ENGEBRETS'EN;

